The Hungarian National Infrasound Network (HNIN, doi:10.14470/UA114590) was established by the Kövesligethy Radó Seismological Observatory of HUN-REN Research Centre for Astronomy and Earth Sciences (HUN-REN FI), Budapest, Hungary, with the deployment of the Piszkés-tető (PSZI) infrasound array in 2017. The PSZI infrasound array is registered in the International Registry of Seismographic Stations, and the HNIN has been assigned the FDSN network code HN (https://geofon.gfz-potsdam.de/doi/network/HN).

The Piszkés-tető infrasound array is located in Northern Hungary, in the Mátra Mountains, at approximately 930 m above sea level. The array consists of four elements and has an aperture of approximately 300 m. Each element is equipped with a SeismoWave MB3d microbarometer with a built-in digitizer. The central element of the array (PSZI1) is co-located with the permanent broadband seismological station PSZ, which is jointly operated by the HUN-REN FI Kövesligethy Radó Seismological Observatory and the GFZ German Research Centre for Geosciences. The site is situated in a moderately forested area with relatively dense undergrowth, which helps to further reduce environmental noise.

The figure shows the elements of the array (red triangles) as well as the co-located seismic station, PSZ (blue circle). Note that the MTA CSFK owns the site and the fence around the site basically determined the actual geometry and the aperture of the array

The figure shows that the effect of somewhat suboptimal geometry is apparent in the error distribution of azimuth and velocity estimations.

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Last Updated: 18 November 2025